1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44345bc0f0042595894021f71ba98ea5496b4c28c68d05626317cf2fe0e7632b. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e78614b3-480c-4604-aa51-3670aaa2ca86.json and https://artists.proofprofile.net/proofs/artist/e78614b3-480c-4604-aa51-3670aaa2ca86.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Frederick Chopin, Waltz Opus 64 No. 1 'Minute Waltz'
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x094e9d0ccf77bce4944bbd8107cf09899b20b058d2e8ae1f17b397ab99fdf05e. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM90619685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0be7f54c6da49ee1c488e96a2fb587399791c3dc6f9b0b1f98e0a0b2d89826a. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962302280.
Gargiulo: Sonata No. 4 for Violin and Piano "From the Window"
Sonata No. 4 for Violin and Piano "From the Window": I. The Ocean
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90636a1d79c3655503a435d450c529152c8373689956be21f30717ee5e751a71. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962401111.
Sonata No. 4 for Violin and Piano "From the Window": II. The Sky
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed34d2032d3dd32a467b745de8dbf5d7aa2a99d16f9c2479a5d4c919737bae04. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962401112.
Sonata No. 4 for Violin and Piano "From the Window": III. The Earth
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d54c27dc856a5cdbd10f5acb4147a5bd5999ebe1c74b79ed6c835bbbbbc08ca. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962401113.
Sonata No. 4 for Violin and Piano "From the Window": IV. The People
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84beb5bad5762173e3100200cdcfcd51d651446b5d4a7c6f9f139ac1fecade01. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN962401114.